When I run the install program, my rotor controller chatters,
and my antennas move.

On some systems, it is necessary to remove the rotor drive outputs from the
KCT, before running the install program. This involves opening the DB25 end of
the supplied cable, and temporarily removing the UP, DOWN, LEFT, and RIGHT
wires. These are pins 3, 5, 7, and 9. Be sure to note the corresponding
colors, in order to reinstall these wires correctly after the install program
has been run.